Wireless telegraph and telephone aerial



June 20, 1933. c s FRANKLIN 1,914,887

WIRELESS TELEGRAPH AND TELEPHONE AERIAL Original Filed Sept. 22, 1926CHARLES SAMUEL FRANKLIN ATTORNEY- Patented June 20, 1933 UNETED STATESPATENT OFFER CHAR-LES SAMUEL FRANKLIN, OF LONDON, ENGLAND, ASSIGNOR TORADIO COB-PO- RA'IION OF AMERICA, A CORPORATION OF DELAWARE WIRELESSTELEGRAPH AND TELEPHONE AERIAL Original application filed September 22,1926, Serial No. 136,908, and in Great Britain October 7, 1925.

Divided and this application filed December 14, 1932.

This invention relates to improvements in aerial systems for use inwireless telegraphy and telephony, and more particularly to systemscomprising a plurality of aerials of the kind described in my UnitedStates Patent No. 1,821,936 granted September 8, 1931, wherein there isdescribed an aerial in which strong directive qualities are obtained bysuppressing radiation from every alternate half wave length. The presentapplication is a division of my copending application Serial No.186,908, filed September 22, 1926.

According to one feature of the present invention a plurality ofaerials, such as are described in United States Patent No. 1,821,936,supra, are coupled or connected together in such manner that currents ofthe correct frequency in any of the aerials cause currents of the samephase in adjacent aerials.

Such aerial systems may be constructed in various ways according to theparticular form which the aerial may take.

For example, in the case of an aerial system constructed of aerials eachof which is made non-radiating over alternate half wave lengths byfolding the half Wave lengths so that radiation therefrom is annulled,the aerials are coupled together at the folded portions.

In a modification, in which the aerial system is constructed as a lineof aerials, each of which is so formed that radiation from alternatehalf wave lengths is suppressed by forming these lengths as electricalequivalents, the extreme radiating sections of each aerial are bent overand directly connected in pairs. In such an arrangement the aerial may,in eflect, form one continuous wire and, if desired, it may be so made.

In a further modification the aerial system comprises a continuous wirebent back and forth upon itself, each of the straight portions formingan aerial half a wave length as; 1 g

' proximately half a wave length.

Serial No. 647,108.

Other features and advantages will hereinafter appear.

In the accompanying diagrammatic drawing which illustrates the nature ofthe invention, Figure 1 shows an arrangement in accordance with myinvention wherein four aerials are directly connected to maintaincurrents in phase, and Figure 2 is a modificatior of Figure 1.

Referring to Figure 1, there are shown four aerials 1, 2, 3 and 4 of atype similar to that described in United States Patent 1,821,- 936,supra, each aerial comprising three radiating sections R and twonon-radiating sections S, the latter being formed each as a coil of Wireelectrically equivalent to one half Wave length of the aerial. The endradiating sections of each aerial are bent over and directly connectedin pairs, so that the aerial system is formed, in efiect, of onecontinuous wire, and may be so made, if desired.

The juncture of the aerials 2, 3 is supplied witjh current through anaerial transformer Since the oscillations in the several aerials are inphase they will substantially neutralize each other in a direction alonga plane passed through the several aerials, but will add together toradiate a beam of energy in a direction normal to their plane. Byadjusting the phase of the current in the several aerials the desireddirection of radiation may be obtained.

The arrangement shown in Figure 2 differs from that of Figure 1 only inthat the nonradiating sections S of the aerials are formed each of alength of aerial electrically equivalent to one half wave length bentback and forth upon itself to annul or suppress the radiation.

Having now particularly described and ascertained the nature of myinvention, what I claim is:

1. A directional aerial system comprising a plurality of aerials whereinradiation is suppressed from every alternate half wave length, wherebyeach aerial has alternate radiating and substantially non-radiatingsections, and means for serially connecting the aerials together inpairs at their extreme radiating sections.

2. An antenna for radio wave communication comprising a plurality ofparallel linear half wavelength radiators, and means for seriallyconnecting said radiators together.

3. An antenna system comprising a plurality of parallel linear half wavelength radiators spaced apart, the spacing between adj acent radiatorsbeing equal to one half wave length, and means for serially connectingthe radiators together.

4. An antenna system comprising a plurality of parallel linear half wavelength radiators, and means for connecting corresponding ends ofadjacent radiators together alternately so as to constitute the whole asingle series circuit of generally zigzag form.

5. An antenna system comprising two parallel elements each an oddmultiple of a half wave length long, and a conductor a multiple of ahalf wave length long electrically connected between said elements.

6. An antenna system comprising a plurality of parallel elements each anodd multiple of a half wavelength long, and a plurality of conductorseach a multiple of a half wave length long and connected electrically inseries between different elements.

7. An antenna system comprising a plurality of parallel elements each anodd multiple of a half wave length long, and a plurality of conductorseach a multiple of a half wave length long, said conductors beingincluded between corresponding terminals of adjacent elementsalternately whereby the arrangement constitutes a zigzag antenna.

CHARLES SAMUEL FRANKLIN.

